Usually there is only one or two a year bright enough to be seen with the naked eye.
通常，一年只有一到两颗彗星明亮得肉眼可见。
Most stars are not visible to the naked eye.
大多数星星肉眼看不见。
They look like stars to the naked eye.
用肉眼看上去它们像星星。
Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, why is Mars red?
水银是一种液态金属，而水星这颗行星，是肉眼能看到的运动最快的天体。火星，为什么火星是红色的？
What appears to the naked eye to be glowing is actually a superposition of different lines of distinct frequency. So, this is quantized.
出现在肉眼面前的光亮，事实上是频率不同的光线的叠加。所以，这是量子化的。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
Maybe you can see the Great Wall clearly from space with binoculars but not with the naked eye.
也许你可以用双筒望远镜从太空中清楚地看到长城，但用肉眼却看不见。
But all bubbles are identifiable, and the process described in the paragraph above is not invisible to the naked eye.
不过，所有泡沫都是可以辨认的，即使仅凭肉眼也能观察到上文中所描述的过程。
Some star clusters can beseen with the naked eye, such as the famous Pleiades cluster in theconstellation Taurus.
我们可以用肉眼观察到一些星团，例如位于金牛座内大名鼎鼎的昴星团。
The galaxy is visible to the naked eye on moonless nights as a smudge of light and is the most distant object visible without a telescope.
该星系在无月夜的夜晚可由肉眼观测到一个小光斑，它也是不借助望远镜能被肉眼观测的最远天体。
A great number of these collisions create the light that's visible to the naked eye.
数以万计的这种撞击就形成了我们肉眼所能够看到的这种光。
Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?
水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体，火星，铁，为什么火星是红色的？
All are clearly visibly different to the naked eye.
这些不同全部都是肉眼可见。
The letters are invisible to the naked eye, and can only be read with a medical microscope at 400 times magnification.
这些字母小到用肉眼无法识别，只能用放大400倍的医学显微镜才能看清。
Binoculars, a telescope or even the naked eye will provide a view of the moon's craters and surface features.
双筒望远镜、望远镜、甚至用肉眼会看到月亮上的陨石坑和表面的地貌。
Visitors grabbed their darkened glasses in anticipation, following reminders that viewing with the naked eye could damage their eyesight.
在受到裸眼观看会影响视力的提醒后，游客们满怀期待地戴上暗色眼镜。
Scientists said the eclipse could be safely observed with the naked eye.
科学家表示本次月食裸眼观测是安全的。
It becomes visible to the naked eye every 76 years when it nears the sun.
它每隔76年靠近太阳时，变得肉眼可见。
Urban light pollution means that one-fifth of the world's population can no longer see the Milky Way with the naked eye.
都市的光污染意味着，世界上五分之一的人们仅凭借裸眼将看不到银河。
Some of the most spectacular night skies are visible to the naked eye - although sadly not from the UK.
一些最耀眼的夜空可以用肉眼看到——但很可惜不在英国。
Ancient man also noticed how the five planets visible to the naked eye twinkled in the night sky.
古代的人们看到肉眼可见的五大行星在夜幕中闪烁。
Instead, even objects big enough to be seen with the naked eye can take on slippery quantum properties.
甚至大到用肉眼也可看见的物体也有一些量子性质。
A corneal ulcer can be seen as a white or gray round spot on the cornea that is visible with the naked eye.
裸眼就可观察到角膜溃疡为位于角膜上的白色或灰色圆形病灶。
Unlike solar eclipses, lunar eclipses are safe to watch with the naked eye.
与日食不同，裸眼看月食是安全的。
When they shone pulses of light at the cell, it duly produced a "beautiful green" laser beam detectable with the naked eye.
当一束脉冲激光照在这些细胞上后，迅速产生了一条“绚丽的绿光”，此时的激光束可直接用肉眼观察。
With a few tips and tricks you can actually learn to see more in the night sky using your naked eye.
掌握些窍门和技巧后，你可以学到如何借助肉眼在夜空中观察更多的景象。
But they glow red under ultraviolet light, and the dogs' nails and abdomens, which have thin skins, look red even to the naked eye.
但在紫外线的照射下，它们会发出红光，尤其是爪子和皮肤很薄的腹部，用肉眼都能看出发红。
But even then, to the naked eye Mars appeared as nothing more than an extremely bright yellowish-orange star, not at all like the full moon.
可即便如此，在肉眼下当夜的火星也不过就是茫茫苍穹之间一颗颇为明亮的橘红色小点，和满月丁点可比性没有啦。
On a clear day, they can see France with the naked eye, two dozen miles away.
天气晴朗的日子，他们一眼就可望见二十哩外的法国。
On a clear day, they can see France with the naked eye, two dozen miles away.
天气晴朗的日子，他们一眼就可望见二十哩外的法国。
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